Abstract Charge distribution studies for heavy-mass fission products
were carried out in the fast-neutron-induced fission of
,
,
and
using radiochemical and gamma-ray spectrometric
techniques. The width parameter(
), the most
probable charge/mass (
), the charge
polarization (
) and the slope of charge polarization
[
] as a function of the
fragment mass (
) were deduced. The average charge
dispersion parameter (
) and proton
odd-even effect (
) were also obtained for these
fissioning systems. The
and
values in the fissioning systems
and
were
determined for the first time. The
value is also determined for the first time in the
fissioning systems
,
and
. These data
along with the literature data for even-
Z fissioning systems
such as
,
,
,
,
,
,
,
,
,
,
and
(SF) are discussed in
terms of nuclear structure effect and dynamics of descent from the
saddle to the scission point. The role of the excitation energy in
low-energy fission is also discussed.